Low-carbon structural steels 149(b)Figure 2.7 Rolling schedules; (a) normal rolling and normalizing; (b) thermomechanical
processing
size at the reheating stage, it is equally important that micro-alloying elements
are taken into solution so as to be available for the control of recrystaUization and
precipitation strengthening at later stages in the process. This dual requirement is
often achieved by making multiple micro-alloy additions, incorporating the less
soluble elements such as niobium and titanium for grain size control during
reheating together with vanadium, which dissolves more readily and which
provides substantial precipitation strengthening.